CVE-2026-44300: OpenCost provides cost monitoring for Kubernetes workloads and cloud costs

Q: How do I fix CVE-2026-44300?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Q: Is CVE-2026-44300 being exploited?

CVE-2026-44300 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-44300 affect?

CVE-2026-44300 affects affected software. Severity is high (CVSS 8.8). OpenCost provides cost monitoring for Kubernetes workloads and cloud costs. Prior to 1.121.0, the POST /serviceKey endpoint in pkg/costmodel/router.go allows a network client to invoke AddServiceKey without mandatory authentication and subm

Q: How urgent is CVE-2026-44300?

Priority 57/100. High severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 8.8REMOTEWATCHLIST

CVE-2026-44300 is a high-severity flaw (CVSS 8.8) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenCost provides cost monitoring for Kubernetes workloads and cloud costs. Prior to 1.121.0, the POST /serviceKey endpoint in pkg/costmodel/router.go allows a network client to invoke AddServiceKey without mandatory authentication and submit an arbitrary key form value that is written to the GCP service-account key.json file returned by GetGCPAuthSecretFilePath in core/pkg/env/core.go. The attacker controls the file contents but not the CONFIG_P

Why this priority

High severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-20, CWE-309
Published	2026-09-15
Last modified	2026-09-30

Publisher (CNA): GitHub, Inc.

Last updated 2026-09-30 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-09-15 18:17 UTCPublished CVE record published
2026-09-30 17:43 UTCUpdated Record last modified

Exact fixes by distribution

Go · github.com/opencost/opencost · FIXED · 1.119.1 · vulnerable: < 1.119.1 · source

go get github.com/opencost/opencost@v1.119.1 go list -m github.com/opencost/opencost

Fedora 46 · icecat · FIXED · 153.6.0-2.rh1.fc46 · FEDORA-2026-25e05b5320 · source

sudo dnf upgrade --advisory=FEDORA-2026-25e05b5320

Fedora ELN · edk2 · FIXED · 20260812-14.eln159 · FEDORA-2026-8850ef9153 · source

sudo dnf upgrade --advisory=FEDORA-2026-8850ef9153

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/opencost/opencost/security/advisories/GHSA-wmj8-9953-vff5

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-44300?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-44300 being exploited?

CVE-2026-44300 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-44300 affect?

CVE-2026-44300 affects affected software. Severity is high (CVSS 8.8). OpenCost provides cost monitoring for Kubernetes workloads and cloud costs. Prior to 1.121.0, the POST /serviceKey endpoint in pkg/costmodel/router.go allows a network client to invoke AddServiceKey without mandatory authentication and subm

How urgent is CVE-2026-44300?

Priority 57/100. High severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Kubernetes vulnerabilities

References

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